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Validating Plugin Extension System in Day.js

This test suite validates the plugin extension functionality in Day.js, focusing on how plugins can extend both instance and static methods. It verifies the core plugin architecture and utility access mechanisms.

Test Coverage Overview

The test suite provides comprehensive coverage of Day.js plugin system functionality.

Key areas tested include:

Plugin extension mechanism for instance methods
Static method extension capabilities
Plugin configuration options handling
Access to core utility functions
Mock date handling for consistent testing

Implementation Analysis

The testing approach utilizes Jest’s modular testing patterns with MockDate for consistent datetime handling. The implementation demonstrates both basic and configured plugin extensions, verifying the plugin architecture’s flexibility.

Technical patterns include:

Before/after hooks for date mocking
Prototype-based method extension testing
Static function addition verification
Configuration parameter validation

Technical Details

Testing infrastructure includes:

Jest as the primary testing framework
MockDate for date manipulation
Custom plugin test helpers
ES6 module import system
Prototype-based extension patterns

Best Practices Demonstrated

The test suite exemplifies high-quality testing practices through modular test organization and comprehensive coverage.

Notable practices include:

Isolated test cases for each plugin feature
Consistent test environment setup/teardown
Clear test case descriptions
Verification of both success paths and utility access
Proper mock handling and cleanup

iamkun/dayjs

test/plugin.test.js

            
import MockDate from 'mockdate'
import dayjs from '../src'

const testPlugin = (o, c, d) => {
  c.prototype.newApi = () => ('hello world')
  d.newFunc = () => ('hi world')
}
const testPluginWithConfig = (o, c) => {
  c.prototype.newApiWithConfig = () => (`hello world ${o || ''}`)
}

dayjs.extend(testPlugin)
dayjs.extend(testPluginWithConfig, 'good')

beforeEach(() => {
  MockDate.set(new Date())
})

afterEach(() => {
  MockDate.reset()
})

it('Plugin extend method and option', () => {
  expect(dayjs().newApi()).toBe('hello world')
  expect(dayjs().newApiWithConfig()).toBe('hello world good')
})

it('Plugin extend dayjs', () => {
  expect(dayjs.newFunc()).toBe('hi world')
})

it('Plugin use core utils', () => {
  // u => isUndefined
  expect(dayjs().$utils().u).toBeInstanceOf(Function)
})